|Number|Arrangement|Year, Builder|Number|Arrangement|Year, Builder|Number|Model|Year, Builder|
|---|---|---|---|---|---|---|---|---|
|Governor Markham|2-4-2T|1891, Baldwin|Number 7|0-6-0|1914, Alco-Brooks|Number 20|S2|Alco|
|Number 2|0-4-2T|1901, Baldwin|Number 8|0-6-0|1916|Number 21|S2|Alco|
|Number 3|0-4-2T|1904, Baldwin|Number 9|0-6-0|1920, Alco-Brooks|Number 22|S2|1944, Alco|
|Number 4|||Number 10|0-6-0|1923, Baldwin|Number 23|S2|1944, Alco|
|Number 5|||Number 11|0-6-0|1927|Number 24|S2|1945, Alco|
|Number 6|0-6-0|1913, Baldwin|Number 12|||Number 25|S2|Alco|

Question: how many trains on this graph do not mention alco or alco-brooks as its builder?
Answer: 10